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RPM HOWTO

Table of Contents
1. Introduction
2. Overview
3. General Information
3.1. Acquiring RPM
3.2. RPM Requirements
4. Using RPM
5. Now what can I really do with RPM?
6. Building RPMs
6.1. The Spec File
6.2. The Header
6.3. Prep
6.4. Build
6.5. Install
6.6. Cleaning your system
6.7. Optional pre and post Install/Uninstall Scripts
6.8. Files
6.9. Changelog
7. Building It
7.1. The Source Directory Tree
7.2. Test Building
7.3. Generating the File List
7.4. Building the Package with RPM
7.5. Testing It
7.6. What to do with your new RPMs
7.7. What Now?
8. Multi-architectural RPM Building
8.1. Sample spec File
8.2. Optflags
8.3. Macros
8.4. Excluding Architectures from Packages
8.5. Finishing Up
1. Introduction
RPM is the RPM Package Manager. It is an open packaging system available for
anyone to use. It allows users to take source code for new software and
package it into source and binary form such that binaries can be easily
installed and tracked and source can be rebuilt easily. It also maintains a
database of all packages and their files that can be used for verifying
packages and querying for information about files and/or packages.
Red Hat, Inc. encourages other distribution vendors to take the time to look
at RPM and use it for their own distributions. RPM is quite flexible and easy
to use, though it provides the base for a very extensive system. It is also
completely open and available, though we would appreciate bug reports and
fixes. Permission is granted to use and distribute RPM royalty free under the
GPL.
More complete documentation is available on RPM in the book by Ed Bailey,
Maximum RPM. That book is available for download or purchase at [http://
www.redhat.com] www.redhat.com.
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2. Overview
First, let me state some of the philosophy behind RPM. One design goal was to
allow the use of "pristine" sources. With RPP (our former packaging system of
which none of RPM is derived), our source packages were the "hacked" sources
that we built from.
Theoretically, one could install a source RPP and then make it with no
problems. But the sources were not the original ones, and there was no
reference as to what changes we had to make to get it to build. One had to
download the pristine sources separately. With RPM, you have the pristine
sources along with patches that we used to compile from. We see this as a big
advantage. Why? Several reasons. For one, if a new version of a program comes
out, you don't necessarily have to start from scratch to get it to compile
under RHL. You can look at the patch to see what you might need to do. All
the compile-in defaults are easily visible this way.
RPM is also designed to have powerful querying options. You can do searches
through your entire database for packages or just certain files. You can also
easily find out what package a file belongs to and where it came from. The
RPM files themselves are compressed archives, but you can query individual
packages easily and quickly because of a custom binary header added to the
package with everything you could possibly need to know contained in
uncompressed form. This allows for fast querying.
Another powerful feature is the ability to verify packages. If you are
worried that you deleted an important file for some package, just verify it.
You will be notified of any anomalies. At that point, you can reinstall the
package if necessary. Any config files that you had are preserved as well.
We would like to thank the folks from the BOGUS distribution for many of
their ideas and concepts that are included in RPM. While RPM was completely
written by Red Hat, Inc., its operation is based on code written by BOGUS (PM
and PMS).
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3. General Information
3.1. Acquiring RPM
The best way to get RPM is to install Red Hat Linux. If you don't want to do
that, you can still get and use RPM. It can be acquired from [ftp://
ftp.redhat.com/pub/redhat/code/rpm] ftp.redhat.com.
-----------------------------------------------------------------------------
3.2. RPM Requirements
RPM itself should build on basically any Unix-like system. It has been built
and used on Tru64 Unix, AIX, Solaris, SunOS, and basically all flavors of
Linux.
To build RPMs from source, you also need everything normally required to
build a package, like gcc, make, etc.
-----------------------------------------------------------------------------
4. Using RPM
In its simplest form, RPM can be used to install packages:
rpm -i foobar-1.0-1.i386.rpm
The next simplest command is to uninstall a package:
rpm -e foobar
One of the more complex but highly useful commands allows you to install
packages via FTP. If you are connected to the net and want to install a new
package, all you need to do is specify the file with a valid URL, like so:
rpm -i ftp://ftp.redhat.com/pub/redhat/rh-2.0-beta/RPMS/foobar-1.0-1.i386.rpm
Please note, that RPM will now query and/or install via FTP.
While these are simple commands, rpm can be used in a multitude of ways. To
see which options are available in your version of RPM, type:
rpm --help
You can find more details on what those options do in the RPM man page, found
by typing:
man rpm
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5. Now what can I really do with RPM?
RPM is a very useful tool and, as you can see, has several options. The best
way to make sense of them is to look at some examples. I covered simple
install/uninstall above, so here are some more examples:
* Let's say you delete some files by accident, but you aren't sure what you
deleted. If you want to verify your entire system and see what might be
missing, you would do:
rpm -Va
* Let's say you run across a file that you don't recognize. To find out
which package owns it, you would do:
rpm -qf /usr/X11R6/bin/xjewel
The output would be sometime like:
xjewel-1.6-1
* You find a new koules RPM, but you don't know what it is. To find out
some information on it, do:
rpm -qpi koules-1.2-2.i386.rpm
The output would be:
Name : koules Distribution: Red Hat Linux Colgate
Version : 1.2 Vendor: Red Hat Software
Release : 2 Build Date: Mon Sep 02 11:59:12 1996
Install date: (none) Build Host: porky.redhat.com
Group : Games Source RPM: koules-1.2-2.src.rpm
Size : 614939
Summary : SVGAlib action game with multiplayer, network, and sound support
Description :
This arcade-style game is novel in conception and excellent in execution.
No shooting, no blood, no guts, no gore. The play is simple, but you
still must develop skill to play. This version uses SVGAlib to
run on a graphics console.
* Now you want to see what files the koules RPM installs. You would do:
rpm -qpl koules-1.2-2.i386.rpm
The output is:
/usr/doc/koules
/usr/doc/koules/ANNOUNCE
/usr/doc/koules/BUGS
/usr/doc/koules/COMPILE.OS2
/usr/doc/koules/COPYING
/usr/doc/koules/Card
/usr/doc/koules/ChangeLog
/usr/doc/koules/INSTALLATION
/usr/doc/koules/Icon.xpm
/usr/doc/koules/Icon2.xpm
/usr/doc/koules/Koules.FAQ
/usr/doc/koules/Koules.xpm
/usr/doc/koules/README
/usr/doc/koules/TODO
/usr/games/koules
/usr/games/koules.svga
/usr/games/koules.tcl
/usr/man/man6/koules.svga.6
These are just several examples. More creative ones can be thought of really
easy once you are familiar with RPM.
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6. Building RPMs
Building RPMs is fairly easy to do, especially if you can get the software
you are trying to package to build on its own. We assume here that you know
how to build software from source. If you don't you probably shouldn't be
starting with this document.
The basic procedure to build an RPM is as follows:
* Get the source code you are building the RPM for to build on your system.
* Make a patch of any changes you had to make to the sources to get them to
build properly.
* Make a spec file for the package.
* Make sure everything is in its proper place.
* Build the package using RPM.
Under normal operation, RPM builds both binary and source packages.
-----------------------------------------------------------------------------
6.1. The Spec File
We'll begin with discussion of the spec file. Spec files are required to
build a package. The spec file is a description of the software along with
instructions on how to build it and a file list for all the binaries that get
installed.
You'll want to name your spec file according to a standard convention. It
should be the package name-dash-version number-dash-release number-dot-spec.
This will ensure that if you install multiple source RPMs for different
versions of the same package that at least the spec files remain intact.
Here is a small spec file (eject-2.0.2-1.spec):
Summary: A program that ejects removable media using software control.
Name: eject
Version: 2.0.2
Release: 3
Copyright: GPL
Group: System Environment/Base
Source: http://metalab.unc.edu/pub/Linux/utils/disk-management/eject-2.0.2.tar.gz
Patch: eject-2.0.2-buildroot.patch
BuildRoot: /var/tmp/%{name}-buildroot
%description
The eject program allows the user to eject removable media
(typically CD-ROMs, floppy disks or Iomega Jaz or Zip disks)
using software control. Eject can also control some multi-
disk CD changers and even some devices' auto-eject features.
Install eject if you'd like to eject removable media using
software control.
%prep
%setup -q
%patch -p1 -b .buildroot
%build
make RPM_OPT_FLAGS="$RPM_OPT_FLAGS"
%install
rm -rf $RPM_BUILD_ROOT
mkdir -p $RPM_BUILD_ROOT/usr/bin
mkdir -p $RPM_BUILD_ROOT/usr/man/man1
install -s -m 755 eject $RPM_BUILD_ROOT/usr/bin/eject
install -m 644 eject.1 $RPM_BUILD_ROOT/usr/man/man1/eject.1
%clean
rm -rf $RPM_BUILD_ROOT
%files
%defattr(-,root,root)
%doc README TODO COPYING ChangeLog
/usr/bin/eject
/usr/man/man1/eject.1
%changelog
* Sun Mar 21 1999 Cristian Gafton <gafton@redhat.com>
- auto rebuild in the new build environment (release 3)
* Wed Feb 24 1999 Preston Brown <pbrown@redhat.com>
- Injected new description and group.
[ Some changelog entries trimmed for brevity. -Editor. ]
-----------------------------------------------------------------------------
6.2. The Header
The header has some standard fields in it that you need to fill in. There are
a few caveats as well. The fields must be filled in as follows:
* Summary: This is a one line description of the package.
* Name: This must be the name string from the rpm filename you plan to use.
* Version: This must be the version string from the rpm filename you plan
to use.
* Release: This is the release number for a package of the same version
(ie. if we make a package and find it to be slightly broken and need to
make it again, the next package would be release number 2).
* Copyright: This line tells how a package is copyrighted. You should use
something like GPL, BSD, MIT, public domain, distributable, or
commercial.
* Group: This is a group that the package belongs to in a higher level
package tool or the Red Hat installer.
* Source: This line points at the HOME location of the pristine source
file. It is used if you ever want to get the source again or check for
newer versions. Caveat: The filename in this line MUST match the filename
you have on your own system (ie. don't download the source file and
change its name). You can also specify more than one source file using
lines like:
Source0: blah-0.tar.gz
Source1: blah-1.tar.gz
Source2: fooblah.tar.gz
These files would go in the SOURCES directory. (The directory structure
is discussed in a later section, "The Source Directory Tree".)
* Patch: This is the place you can find the patch if you need to download
it again. Caveat: The filename here must match the one you use when you
make YOUR patch. You may also want to note that you can have multiple
patch files much as you can have multiple sources. ] You would have
something like:
Patch0: blah-0.patch
Patch1: blah-1.patch
Patch2: fooblah.patch
These files would go in the SOURCES directory.
* Group: This line is used to tell high level installation programs (such
as Red Hat's gnorpm) where to place this particular program in its
hierarchical structure. You can find the latest description in /usr/doc/
rpm*/GROUPS. The group tree currently looks something like this:
Amusements/Games
Amusements/Graphics
Applications/Archiving
Applications/Communications
Applications/Databases
Applications/Editors
Applications/Emulators
Applications/Engineering
Applications/File
Applications/Internet
Applications/Multimedia
Applications/Productivity
Applications/Publishing
Applications/System
Applications/Text
Development/Debuggers
Development/Languages
Development/Libraries
Development/System
Development/Tools
Documentation
System Environment/Base
System Environment/Daemons
System Environment/Kernel
System Environment/Libraries
System Environment/Shells
User Interface/Desktops
User Interface/X
User Interface/X Hardware Support
* BuildRoot: This line allows you to specify a directory as the "root" for
building and installing the new package. You can use this to help test
your package before having it installed on your machine.
* %description It's not really a header item, but should be described with
the rest of the header. You need one description tag per package and/or
subpackage. This is a multi-line field that should be used to give a
comprehensive description of the package.
-----------------------------------------------------------------------------
6.3. Prep
This is the second section in the spec file. It is used to get the sources
ready to build. Here you need to do anything necessary to get the sources
patched and setup like they need to be setup to do a make.
One thing to note: Each of these sections is really just a place to execute
shell scripts. You could simply make an sh script and put it after the %prep
tag to unpack and patch your sources. We have made macros to aid in this,
however.
The first of these macros is the %setup macro. In its simplest form (no
command line options), it simply unpacks the sources and cd's into the source
directory. It also takes the following options:
* -n name will set the name of the build directory to the listed name. The
default is $NAME-$VERSION. Other possibilities include $NAME, ${NAME}$
{VERSION}, or whatever the main tar file uses. (Please note that these
"$" variables are not real variables available within the spec file. They
are really just used here in place of a sample name. You need to use the
real name and version in your package, not a variable.)
* -c will create and cd to the named directory before doing the untar.
* -b # will untar Source# before cd'ing into the directory (and this makes
no sense with -c so don't do it). This is only useful with multiple
source files.
* -a # will untar Source# after cd'ing into the directory.
* -T This option overrides the default action of untarring the Source and
requires a -b 0 or -a 0 to get the main source file untarred. You need
this when there are secondary sources.
* -D Do not delete the directory before unpacking. This is only useful
where you have more than one setup macro. It should only be used in setup
macros after the first one (but never in the first one).
The next of the available macros is the %patch macro. This macro helps
automate the process of applying patches to the sources. It takes several
options, listed below:
* # will apply Patch# as the patch file.
* -p # specifies the number of directories to strip for the patch(1)
command.
* -P The default action is to apply Patch (or Patch0). This flag inhibits
the default action and will require a 0 to get the main source file
untarred. This option is useful in a second (or later) %patch macro that
required a different number than the first macro.
* You can also do %patch# instead of doing the real command: %patch # -P
* -b extension will save originals as filename.extension before patching.
That should be all the macros you need. After you have those right, you can
also do any other setup you need to do via sh type scripting. Anything you
include up until the %build macro (discussed in the next section) is executed
via sh. Look at the example above for the types of things you might want to
do here.
-----------------------------------------------------------------------------
6.4. Build
There aren't really any macros for this section. You should just put any
commands here that you would need to use to build the software once you had
untarred the source, patched it, and cd'ed into the directory. This is just
another set of commands passed to sh, so any legal sh commands can go here
(including comments).
Important Your current working directory is reset in each of these sections
to the toplevel of the source directory, so keep that in mind. You
can cd into subdirectories if necessary.
The variable RPM_OPT_FLAGS is set using values in /usr/lib/rpm/rpmrc. Look
there to make sure you are using values appropriate for your system (in most
cases you are). Or simply don't use this variable in your spec file. It is
optional.
-----------------------------------------------------------------------------
6.5. Install
There aren't really any macros here, either. You basically just want to put
whatever commands here that are necessary to install. If you have make
install available to you in the package you are building, put that here. If
not, you can either patch the makefile for a make install and just do a make
install here, or you can hand install them here with sh commands. You can
consider your current directory to be the toplevel of the source directory.
The variable RPM_BUILD_ROOT is available to tell you the path set as the
Buildroot: in the header. Using build roots are optional but are highly
recommended because they keep you from cluttering your system with software
that isn't in your RPM database (building an RPM doesn't touch your
database...you must go install the binary RPM you just built to do that).
-----------------------------------------------------------------------------
6.6. Cleaning your system
It's a good idea to always make sure there is a clean build root before
building a package a second time on a system. The %clean macro will help with
that. Simply put the proper commands there to blow away a former build root.
Anal, err, careful folks may want to test that RPM_BUILD_ROOT wasn't set to /
before doing something this volatile.
-----------------------------------------------------------------------------
6.7. Optional pre and post Install/Uninstall Scripts
You can put scripts in that get run before and after the installation and
uninstallation of binary packages. A main reason for this is to do things
like run ldconfig after installing or removing packages that contain shared
libraries. The macros for each of the scripts is as follows:
* %pre is the macro to do pre-install scripts.
* %post is the macro to do post-install scripts.
* %preun is the macro to do pre-uninstall scripts.
* %postun is the macro to do post-uninstall scripts.
The contents of these sections should just be any sh style script, though you
do not need the #!/bin/sh.
-----------------------------------------------------------------------------
6.8. Files
This is the section where you must list the files for the binary package. RPM
has no way to know what binaries get installed as a result of make install.
There is NO way to do this. Some have suggested doing a find before and after
the package install. With a multiuser system, this is unacceptable as other
files may be created during a package building process that have nothing to
do with the package itself.
There are some macros available to do some special things as well. They are
listed and described here:
* %doc is used to mark documentation in the source package that you want
installed in a binary install. The documents will be installed in /usr/
doc/$NAME-$VERSION-$RELEASE. You can list multiple documents on the
command line with this macro, or you can list them all separately using a
macro for each of them.
* %config is used to mark configuration files in a package. This includes
files like sendmail.cf, passwd, etc. If you later uninstall a package
containing config files, any unchanged files will be removed and any
changed files will get moved to their old name with a .rpmsave appended
to the filename. You can list multiple files with this macro as well.
* %dir marks a single directory in a file list to be included as being
owned by a package. By default, if you list a directory name WITHOUT a
%dir macro, EVERYTHING in that directory is included in the file list and
later installed as part of that package.
* %defattr allows you to set default attributes for files listed after the
defattr declaration. The attributes are listed in the form (mode, owner,
group) where the mode is the octal number representing the bit pattern
for the new permissions (like chmod would use), owner is the username of
the owner, and group is the group you would like assigned. You may leave
any field to the installed default by simply placing a - in its place, as
was done in the mode field for the example package.
* %files -f <filename> will allow you to list your files in some arbitrary
file within the build directory of the sources. This is nice in cases
where you have a package that can build it's own filelist. You then just
include that filelist here and you don't have to specifically list the
files.
The biggest caveat in the file list is listing directories. If you list /usr/
bin by accident, your binary package will contain every file in /usr/bin on
your system.
-----------------------------------------------------------------------------
6.9. Changelog
This is a log of what changes occurred when the package is updated. If you
are modifying an existing RPM it is a good idea to list what changes you made
here.
The format is simple. Start each new entry with a line with a * followed by
the date, your name, and your email address. The date should appear in the
same format that is output by:
date +"%a %b %d %Y"
The rest of the section is a free text field, but should be organized in some
coherent manner.
-----------------------------------------------------------------------------
7. Building It
7.1. The Source Directory Tree
The first thing you need is a properly configured build tree. This is
configurable using the /etc/rpmrc file. Most people will just use /usr/src.
You may need to create the following directories to make a build tree:
* BUILD is the directory where all building occurs by RPM. You don't have
to do your test building anywhere in particular, but this is where RPM
will do it's building.
* SOURCES is the directory where you should put your original source tar
files and your patches. This is where RPM will look by default.
* SPECS is the directory where all spec files should go.
* RPMS is where RPM will put all binary RPMs when built.
* SRPMS is where all source RPMs will be put.
-----------------------------------------------------------------------------
7.2. Test Building
The first thing you'll probably want to to is get the source to build cleanly
without using RPM. To do this, unpack the sources, and change the directory
name to $NAME.orig. Then unpack the source again. Use this source to build
from. Go into the source directory and follow the instructions to build it.
If you have to edit things, you'll need a patch. Once you get it to build,
clean the source directory. Make sure and remove any files that get made from
a configure script. Then cd back out of the source directory to its parent.
Then you'll do something like:
diff -uNr dirname.orig dirname > ../SOURCES/dirname-linux.patch
This will create a patch for you that you can use in your spec file. Note
that the "linux" that you see in the patch name is just an identifier. You
might want to use something more descriptive like "config" or "bugs" to
describe why you had to make a patch. It's also a good idea to look at the
patch file you are creating before using it to make sure no binaries were
included by accident.
-----------------------------------------------------------------------------
7.3. Generating the File List
Now that you have source that will build and you know how to do it, build it
and install it. Look at the output of the install sequence and build your
file list from that to use in the spec file. We usually build the spec file
in parallel with all of these steps. You can create the initial one and fill
in the easy parts, and then fill in the other steps as you go.
-----------------------------------------------------------------------------
7.4. Building the Package with RPM
Once you have a spec file, you are ready to try and build your package. The
most useful way to do it is with a command like the following:
rpm -ba foobar-1.0.spec
There are other options useful with the -b switch as well:
* p means just run the prep section of the specfile.
* l is a list check that does some checks on %files.
* c do a prep and compile. This is useful when you are unsure of whether
your source will build at all. It seems useless because you might want to
just keep playing with the source itself until it builds and then start
using RPM, but once you become accustomed to using RPM you will find
instances when you will use it.
* ido a prep, compile, and install.
* b prep, compile, install, and build a binary package only.
* abuild it all (both source and binary packages).
There are several modifiers to the -b switch. They are as follows:
* --short-circuit will skip straight to a specified stage (can only be used
with c and i).
* --clean removes the build tree when done.
* --keep-temps will keep all the temp files and scripts that were made in /
tmp. You can actually see what files were created in /tmp using the -v
option.
* --test does not execute any real stages, but does keep-temp.
-----------------------------------------------------------------------------
7.5. Testing It
Once you have a source and binary rpm for your package, you need to test it.
The easiest and best way is to use a totally different machine from the one
you are building on to test. After all, you've just done a lot of make
install's on your own machine, so it should be installed fairly well.
You can do an rpm -e packagename on the package to test, but that can be
deceiving because in building the package, you did a make install. If you
left something out of your file list, it will not get uninstalled. You'll
then reinstall the binary package and your system will be complete again, but
your rpm still isn't. Make sure and keep in mind that just because you do a
rpm -ba package, most people installing your package will just be doing the
rpm -i package. Make sure you don't do anything in the build or install
sections that will need to be done when the binaries are installed by
themselves.
-----------------------------------------------------------------------------
7.6. What to do with your new RPMs
Once you've made your own RPM of something (assuming its something that
hasn't already been RPM'ed), you can contribute your work to others (also
assuming you RPM'ed something freely distributable). To do so, you'll want to
upload it to [ftp://ftp.redhat.com] ftp.redhat.com.
-----------------------------------------------------------------------------
7.7. What Now?
Please see the above sections on Testing and What to do with new RPMs. We
want all the RPMs available we can get, and we want them to be good RPMs.
Please take the time to test them well, and then take the time to upload them
for everyone's benefit. Also, please make sure you are only uploading freely
available software. Commercial software and shareware should not be uploaded
unless they have a copyright expressly stating that this is allowed. This
includes ssh, pgp, etc.
-----------------------------------------------------------------------------
8. Multi-architectural RPM Building
RPM can now be used to build packages for the Intel i386, the Digital Alpha
running Linux, and the Sparc (and others). There are several features that
make building packages on all platforms easy. The first of these is the
"optflags" directive in the /etc/rpmrc. It can be used to set flags used when
building software to architecture specific values. Another feature is the
"arch" macros in the spec file. They can be used to do different things
depending on the architecture you are building on. Another feature is the
"Exclude" directive in the header.
-----------------------------------------------------------------------------
8.1. Sample spec File
The following is part of the spec file for the "fileutils" package. It is
setup to build on both the Alpha and the Intel.
Summary: GNU File Utilities
Name: fileutils
Version: 3.16
Release: 1
Copyright: GPL
Group: Utilities/File
Source0: prep.ai.mit.edu:/pub/gnu/fileutils-3.16.tar.gz
Source1: DIR_COLORS
Patch: fileutils-3.16-mktime.patch
%description
These are the GNU file management utilities. It includes programs
to copy, move, list, etc, files.
The ls program in this package now incorporates color ls!
%prep
%setup
%ifarch alpha
%patch -p1
autoconf
%endif
%build
configure --prefix=/usr --exec-prefix=/
make CFLAGS="$RPM_OPT_FLAGS" LDFLAGS=-s
%install
rm -f /usr/info/fileutils*
make install
gzip -9nf /usr/info/fileutils*
.
.
.
-----------------------------------------------------------------------------
8.2. Optflags
In this example, you see how the "optflags" directive is used from the /etc/
rpmrc. Depending on which architecture you are building on, the proper value
is given to RPM_OPT_FLAGS. You must patch the Makefile for your package to
use this variable in place of the normal directives you might use (like -m486
and -O2). You can get a better feel for what needs to be done by installing
this source package and then unpacking the source and examine the Makefile.
Then look at the patch for the Makefile and see what changes must be made.
-----------------------------------------------------------------------------
8.3. Macros
The %ifarch macro is very important to all of this. Most times you will need
to make a patch or two that is specific to one architecture only. In this
case, RPM will allow you to apply that patch to just one architecture only.
In the above example, fileutils has a patch for 64 bit machines. Obviously,
this should only be applied on the Alpha at the moment. So, we add an %ifarch
macro around the 64 bit patch like so:
%ifarch axp
%patch1 -p1
%endif
This will insure that the patch is not applied on any architecture except the
alpha.
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8.4. Excluding Architectures from Packages
So that you can maintain source RPMs in one directory for all platforms, we
have implemented the ability to "exclude" packages from being built on
certain architectures. This is so you can still do things like
rpm --rebuild /usr/src/SRPMS/*.rpm
and have the right packages build. If you haven't yet ported an application
to a certain platform, all you have to do is add a line like:
ExcludeArch: alpha
to the header of the spec file of the source package. Then rebuild the
package on the platform that it does build on. You'll then have a source
package that builds on an Intel and can easily be skipped on an Alpha.
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8.5. Finishing Up
Using RPM to make multi-architectural packages is usually easier to do than
getting the package itself to build both places. As more of the hard packages
get built this is getting much easier, however. As always, the best help when
you get stuck building an RPM is to look a similar source package.